While I have not heard your choices, my vote goes to the Sim Audio Moon I-5. I've owned this unit for nearly 2 years, matched with JPS Superconductor interconnects and Cardas Cross speaker cables along with reasonably sensitive speakers (Totem Model 1 Sig./current hungry but works well), the I-5 gives you an honest portrayal of the source. I could try and comment on the bass, treble and midrange but that would be a waste of time. This thing, to my ears, simply sound like musicians playing music before me. If you do audition the I-5 make sure that it's been plugged in and at least on standby for 3 days min. The character of this amp changes dramatically within those days from sounding average to missing bass and then to slowly coming to life. Check out their website for reviews or check AudioReview for what others have to say. The only thing against the I-5 is the remote. Heavy duty as it is, it's a bit tempremental (apparently a new one is on the works). Lastly, the I-5 is no powerhouse integrated. If you're looking to listen in the 3 digit db range this int. may not be for you. As B. Harley mentioned in his Fi review, it's all about how the I-5 brought the music to life. Good luck.
